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CVE-2012-4461

Published: 6 November 2012

The KVM subsystem in the Linux kernel before 3.6.9, when running on hosts that use qemu userspace without XSAVE, allows local users to cause a denial of service (kernel OOPS) by using the KVM_SET_SREGS ioctl to set the X86_CR4_OSXSAVE bit in the guest cr4 register, then calling the KVM_RUN ioctl.

From the Ubuntu security team

Jon Howell reported a flaw in the Linux kernel's KVM (Kernel-based virtual machine) subsystem's handling of the XSAVE feature. On hosts, using qemu userspace, without the XSAVE feature an unprivileged local attacker could exploit this flaw to crash the system.

Priority

Medium

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
Patches:
other: http://article.gmane.org/gmane.comp.emulators.kvm.devel/100742
Introduced by

2acf923e38fb6a4ce0c57115decbb38d334902ac

Fixed by 6d1068b3a98519247d8ba4ec85cd40ac136dbdf9
linux-armadaxp
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-ec2
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-flo
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-gke
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-goldfish
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-grouper
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-hwe
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-hwe-edge
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-linaro-omap
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-linaro-shared
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-backport-maverick
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-backport-natty
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-backport-oneiric
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-quantal
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-trusty
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-utopic
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-vivid
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-wily
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-lts-xenial
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-maguro
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-mako
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-manta
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-mvl-dove
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-qcm-msm
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-raspi2
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-snapdragon
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)
linux-ti-omap4
Launchpad, Ubuntu, Debian
upstream
Released (3.7~rc6)